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This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

A344552 a(n) = Sum_{k=1..n} floor(k*(n-k)/n).

Table of values

n a(n)
1 0
2 0
3 0
4 1
5 2
6 3
7 4
8 6
9 10
10 12
11 14
12 17
13 22
14 25
15 28
16 34
17 40
18 46
19 50
20 55
21 62
22 69
23 74
24 80
25 94
26 100
27 108
28 115
29 126
30 133
31 142
32 152
33 164
34 176
35 184
36 197
37 210
38 221
39 230
40 242
41 260
42 272
43 286
44 297
45 314
46 327
47 340
48 354
49 378
50 394
51 406
52 423
53 442
54 459
55 472
56 488
57 512
58 532
59 548
60 563
61 590
62 607

List of values

[0, 0, 0, 1, 2, 3, 4, 6, 10, 12, 14, 17, 22, 25, 28, 34, 40, 46, 50, 55, 62, 69, 74, 80, 94, 100, 108, 115, 126, 133, 142, 152, 164, 176, 184, 197, 210, 221, 230, 242, 260, 272, 286, 297, 314, 327, 340, 354, 378, 394, 406, 423, 442, 459, 472, 488, 512, 532, 548, 563, 590, 607]

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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